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Ch 1-Computer Organization
School Revise · Class 11 Information Technology · Chapter 1
Computer Organization
Code 802, Class 11. A computer is built from a few key parts. Here we learn the functional units, memory, number systems and logic gates.
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What this chapter is about
A computer follows input, process, output, storage. It is built from functional units, memory, and tiny switches that follow the rules of logic.
1. Functional units
The input unit takes data in, the CPU (with the ALU, Control Unit and registers) processes it, the memory stores it, and the output unit shows the result.
2. Memory and number systems
Primary memory (RAM, ROM) is fast; secondary memory (disk) is permanent. Computers store data in binary (base 2). Other systems are decimal (10) and hexadecimal (16).
3. Logic gates
A logic gate is a tiny switch that follows a rule. AND gives 1 only if both inputs are 1, OR gives 1 if any input is 1, and NOT reverses the input.
Practise with the interactive
Explore the idea by tapping. The interactive opens right here in the lesson.
Practice set A, multiple choice
1. The brain of the computer is the …
CPU.
2. Which memory is volatile?
RAM.
3. The base of the binary system is …
2.
4. Which gate gives 1 only if both inputs are 1?
AND.
Practice set B, short answer
1. Name the three parts of the CPU.
ALU, Control Unit and registers.
2. State one difference between RAM and ROM.
RAM is volatile (lost on power off); ROM is non volatile.
3. What does an OR gate do?
It gives 1 if any input is 1.
Quick summary
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A computer follows input, process, output and storage. Its units are input, CPU (ALU, Control Unit, registers), memory and output. RAM is volatile, ROM is non volatile, and secondary memory is permanent. Data is stored in binary. Logic gates follow rules: AND needs both inputs 1, OR needs any input 1, and NOT reverses the input. |
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These free Class 11 Information Technology (Code 802) notes explain computer organization, functional units, memory, number systems, and the AND OR and NOT logic gates with worked examples and practice, for CBSE students across India and the Gulf including the UAE, Saudi Arabia, Qatar, Oman, Kuwait and Bahrain.
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